Procedure To Refer Burner Operating Condition In High Altitude Plants - Riello RS 70/EV Installation, Use And Maintenance Instructions

The firing rates were obtained in special test boilers. Fig. 5 indi-
cates the diameter and length of the test combustion chamber.
3.8.1 Procedure to refer burner operating condition
in high altitude plants
Find the corrected burner capacity for the plant's altitude in chart
1 and the corrected pressure in chart 2.
Check in the firing rate graph of the burner (Fig. 4), if the working
point defined by the values above is within the range limits.
If not, higher burner size is needed.
Note
Charts are based only on altitude variation (reference temperature
= 68°F , 20°C)
To get the combined correction in case of different air temperature,
a compensation of 1000 ft each 20°F (305 m each 11°C) is appli-
cable (100 ft = 2°F).
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Technical description of the burner
Example
Output 2579 Mbtu/hr - diameter 24 inch - length 6.6 ft.
Example
Rated capacity = 3000 MBtu/hr - Rated air pressure = 1.5"w.c.
Real altitude = 5000 ft - Real temperature = 108°F
 = 108°F - 68°F (reference temp.) = 40°F (equivalent 2000 ft vari-
ation)
40 : 2 = 20 x 100 = 2000 ft
Proceeding as descripted above and considering a "virtual altitude"
of (5000 + 2000) ft
- 3000 MBtu/hr at 7000 ft, the corrected capacity is 3847 MBtu/hr
- 1.5" WC at 7000 ft, the corrected burner air pressure is 1.92
Reference conditions (Charts 1-2):
–
–
–
12
Ambient temperature 68 °F (20 °C)
Barometric pressure 394" WC (1000 mbar)
Altitude 328 ft a.s.l. (100 m a.s.l.).
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Fig. 5